"I have noted that the NDP leader has not repaid the taxpayers of Canada for $3 million used for parliamentary offices (outside) Ottawa, contrary to the rules of the House of Commons," Harper said in French during question period Wednesday. "It is time for the NDP leader to do the right thing."

The House of Commons board of internal economy is investigating the official Opposition after receiving complaints about NDP satellite offices in Quebec and Saskatchewan being staffed with employees on the House of Commons payroll.

House rules dictate that a political party must pay for partisan work itself, not with House of Commons resources.